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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aca59fead5afc43107a98b7a7670102c26f4e76ae9f9231b3b96ae4e8c03f6c' 
  AND token = '7trSOlZkbtTagx7bI3IIeZ5TUw6hWBnZ4ddhake5OgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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