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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670d66f10cbcee23b5a81e2d0660b5d2fe7923fa7b6f57ad9f5a84d0440f6de0' 
  AND token = '083SIGweg1G/6n/SfDutj0tpi5b9XEFuTKnlJ0JmgW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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