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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0e33c8746fdfd1ff2b6acefb51361ee9192af79f1301af2e9a1ce85f4e6d08' 
  AND token = 'KOZZBIv4SoiFBOPYXnSsusC28iUYdPKcW0IARKx6FXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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