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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0babe9e9433ab7bebe119d6d682354a1162b501c870c8d31e3014a7f0665039b' 
  AND token = '+0e0VJS/HBeRwrYz9zoy2U20FvTO3piXRB+FgLLxQVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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