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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb55f6b7e73253e62c05b82550a2ebb05b508613c8a9b0849f060c6b35a42aeb' 
  AND token = '5zXMF6RjkQLXdg6HFJVzOBNRxIYfBVTQq26mjjnoOgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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