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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52386f9921a6a8300dd603973b5ae7eedd969698bcbf95630966b26e6365775' 
  AND token = 'sHlhamN/wYAXgNIZafkBAMbM5XJJ4QLgMHMMWYhKwXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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