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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89083535e9dd8c3868d312af566b54df70a6b889547291bd1e70282341b27414' 
  AND token = '/DsyXaeWBE3l2o+IOE33Al5M8ICuOUkPDGguYI+eEn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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