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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf5c0efe4f551c4436fe73435151a807e2c08d47cb6da531f318fae99a67ca1' 
  AND token = 'd5sgN3H7RNPpknln0CiBhxw/eWHbaQqz8njUWh0kShk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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