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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0576b9137c5ca9da9b3b3cdbcd78d8ab72c48a9fceda23a12d6254852627c74' 
  AND token = 'T/pa+vuKY1mo7vjk3Ih/L5zBv9DttD1oWQOdFGbOl6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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