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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069f020c98a80b6a93879c047d78df9991c2181a3533ba2aafc3d22e88969f5c' 
  AND token = 'LtGnypDq/EZ2xwaZIsq8W8dpY/foWCZDIT8g9EbWzTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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