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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15ba9ed1bcb8eb32fe4a731b3bc68edeb82d2e79bed37c25c133fb3c133077c' 
  AND token = 'AoZa1o+VncQWSNNl6T7Qu4D3d/Ac1Hv92RtCXj2MWi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}