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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9373d5c106043452c3af87cc4500aa22d846a51f62424d42c7b7cdcdd4f7ac01' 
  AND token = '8QYSpFSdZ2LFBVj9x0DXJaDUidMW9iNPu2DY4dPyb94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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