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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774aaae500e9afbbe3e7ed10198cf8a9670bebc6844f5f1174502a6b6759a841' 
  AND token = 'AOxbrDvMKAiU8uoWsXQx884sbpjT0V6qMR9xPmEFdMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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