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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bf231d5d825b0b721d508ba7219fd43f1cae586de79ef056205aa32d59f8ec' 
  AND token = 'AtrYshPXIwZw6J0nOwESSVSI+i7XgOKo5dabdd9dKdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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