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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508603851e3770b79aba1856eee261617fe256c7bbf0c130b30ddea40a486bcf' 
  AND token = 'E+p9h7cLMMouvcs7U0HQLPhHJjem+685M7rbleqjb78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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