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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2d217cf4bdc96298483888ff41d915ebfbfd5d5a1d64f78f4cabb25438ac3c' 
  AND token = '93Ed4H/I4TdYDDG8F2D6Yf5zn897KWNBKuAnTHq47Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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