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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a113696981dca64ce8ec5ce413b977634ca0ca0f197d53440a076b8771d57c32' 
  AND token = 'nK6hVdYi0Xjk15/hKIWsP6pkIFVGwVlcw/WXUNetjfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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