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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3216a23d934be79386b59cca245cacac8e05270fe4c3af808ee322176f875fbc' 
  AND token = 'LzJ97SQcGZMMsCd1XLXBussTTu/Qr2kJm++Q7au8jCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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