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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806b4ca8192dbc93a96b13e6a9ace48b7562adfbc8f39606ae81adf85ba4f798' 
  AND token = '6R61E5Rjngg82kXv7ET7wO73HLMONNkH0R2Yu+tbyIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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