SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba7aa0c89f5c02c226d612ca4d5379512e2fbf6e9b7395949f71c457366216b' 
  AND token = 'wV0jy7V/CQoqH+MDTldFQLW1x/vU0UF+f8mNb3JpmWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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