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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87071614870eeaf8a9ecf72b4eda9ed0ebab210a7d2cf4e071965dc9f962ca7' 
  AND token = 'q/g494YE+T7XSm5lxbnyIrNQQcQNXJDZEhfprU+dEZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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