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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb56d5fa211c2c65d4aad9d7057f8626ae12007c7942b2845d074e6264fe124b' 
  AND token = 'nKxq7abg3TREIa2OOsY97QHYP0aO1eC5mYr/xgWUtVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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