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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce56b30fe2aec3d0f52cd355658197c12cf9d83942a3e20fcf8769240c1a71c3' 
  AND token = 'oziQnHQXwT2kJDd7/nSYaXdh4mIqhMqnZCau2Zv88GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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