SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466ef7246b3916a3642590542988d3fd56719afd8d8dcafee2ed71014388dc80' 
  AND token = 'I8gwvVTwZAUAioyrXBNub49HuhgmDwiC/XxdVR73lpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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