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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d70ad7cbc820b83456627b3d4f2a97ae82ddd9d2388c1c1e29979e91b981042' 
  AND token = 'WNLKuu4Gcyjrv8IU/OPtu8JiMTqraC2YFCefFdOqZpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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