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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9c3c42515ebbb5361d35a8a11efd04d898b30845d5ff34c71516d53a32ab29' 
  AND token = '/9PsWpRPqiDpmJOjz3Ylqz2TXibT/8PW1LyU7rPtVGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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