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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90c4c02fe306b9797cf63fe8263a352368dd04f15bf4be2d9dae92638905bc7' 
  AND token = 'e4f0Lql/c/JXUo1NGzMQc2qKmBFcD1KRyxQRqSGoA0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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