SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81b5897548dfb31a1233ca656cdd66f7ea792b1564e9e00117fb940f5816d81' 
  AND token = 'vhB5gWr+P+jJGyYfax077BggpnYTsAlCQpTFYEjBmjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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