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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a60623ea0e6dc5014e0f43f9e6a05f16bd27e0d50a58e3f4f1ae09cf196e61e' 
  AND token = 'c9WQaikJXES26kziWULiH100/dt/hsYQvX2lpB2iLQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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