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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df405511b6a3160cf8e95fb68af7362b43825a3be0984f8babec58b4df5593cd' 
  AND token = 'JzONEIeBY8dgYnD+r5WlqI6OL19rGeB2+DL7m6qU8mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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