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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb597c7d2abed7a99c54911ffb3144a0428c671e61f0d0d7468fe510af27393' 
  AND token = 'uq3qnEIM66g9Dd6r0lB7if6jeJCNKZfl8oxXgi92Sp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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