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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8360fb0fab7c58a8b843ab7ec8ede5f410ab0b8a4ec316e14871efb17a231f' 
  AND token = 'wQO3oa7oAXSnbgebimtMkXIfNMng5YmJqdy9ChH7yxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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