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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160298b4bff3fe46b36def60a63bf90674ab4820b108f3088f69d7c841369a35' 
  AND token = 'P9A+gQ6XwPHaJhIgE8ZxoHUd/On/WpkPem2+FlZwfug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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