SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d4b0e4225f338bdd857da2964e7a2366c858d53589c8afeff0d116995f2262' 
  AND token = '0OYPJ+jIqFO8gvfqSEqIvfwADfSRf/FCFjg0ccpKvzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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