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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c055050d82bc389b7b561f955ace3aa91f8dbf76285d31f2c306126c3002813' 
  AND token = 'jd9yQ1lD/yaPG5rOQnKHUYZ7bMb5Hv5xNMbY4s5ULyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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