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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e47e9a77084c24df6909a923ca68a02a7f526ee5204eca66f1336fd49302c42' 
  AND token = 'FxpEBtFLgJIViFuunRbWCisSEFB4gkE2PkSoBTYECKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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