SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79357599d7dc8ae12222f1abd3b88f8a553a32c96e40d55df1e06dd257cea827' 
  AND token = 'Ur0xEYwNCX4+mu83HfNSQgFQieQ6PRIOdB1I0K3HaJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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