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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757e59da9f40d6ce291481c82994596c807dce0b748b3f6d9c9043edda7deb28' 
  AND token = 'cnZbwBJb8J7EL4gmkvWS25bDjqNXw6U9f6ylHQdx1Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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