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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f7ab239410ea4fbbffd9cb5881d75150e5aece0cb50be775c34b3d276bf90a' 
  AND token = 'uTiBiM4v/ScdHhrLyfiB6uN5kW7F0Qh/izRph4yISek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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