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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d73311e905631006cf9e2535a51aeedcf43142aa31e162ea2eb5f7187b7ef9' 
  AND token = 'E3gUI6TfNArIg3zQy6jkfeHDU/F18lKgR2aEsNnocu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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