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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5629c8e94687f29e4c94ef1dacc87c9402f0a9cdf6f0cf54583afa2e4a275a7' 
  AND token = 'Cc7cZ5CugBT8AHNdCLYWEP8xirwu9Lzamv0JUTqyOI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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