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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfe0a920479e34dad2553734e31ae92b1ac7c1b716aa8e59834414aa3e143eb' 
  AND token = 'kCFBZWZDRgQRvYRrE8UCGcvWBq4i2WHnj1Mb5iXUr9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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