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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34a82de72b994c38852dd3035694ac766faee4d5eefd79b37162e57ed2dfc40' 
  AND token = '3MYh9cOJRnnCD3f/ah3UNCF0Mw90yPI+j1A+0XxHY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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