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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7353baaef2ef2ef113d17acfe7b7b273875b12d922e644b579cc0b9ccc2bec' 
  AND token = 'Xhu6qYPCCSW6J05lrfdgFsJxFeVRTi98mpJVkG59+BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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