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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9393d0637360197cf74d60edb2954577e116e54b31fba6e72cf9925edd6b568' 
  AND token = 'e/8KLMHYX5uCVTRG2t5ApZEKmMMD7iWGU4AwwLEbE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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