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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30299b45a5d182ea2723117e89bdad03ff54d6bd47340037de2861efcdbfe992' 
  AND token = 'UODfatrhgZ3TxJHvw7t5Jy0qtQbrHM6yYEIfQqzE3GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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