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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68faad9acf25f381c6ce910b83deaa4d043d5b3c03b94e493d266eda3311e8f0' 
  AND token = 'xRVDDuvo5jZWIeE1xwZiaM+ajfNZGtZ8rRqGO+eAoH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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