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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd968680b06bc001f6178b810f677ecef5589f2dd7dd803881b6c791dd4da311e' 
  AND token = '2V7nNyqTKAiUNrdDKFFrXxkQPpMzwHnzUdiQvA4SM7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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