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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0d287e646684753248ccdce696395a78d0b7bbb193048696e3082091b6a816' 
  AND token = '735rYi8UXSy0dIDjXZGuMSk83YHJ90xNYG7hqnnZGJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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