SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411a7db736a31633b604e5bf195e67c5018153f71162b80995b1e399d45c7bfb' 
  AND token = 'YxF2UqcGe7plHIJHvmcdYGrWGCyKgw10wLNrZbBxOq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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