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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1838bd4f1f29744b7b8c7c85a99e8787faaee8910ca0a2fd228498855668077a' 
  AND token = 'eLJzklLvTsiwEnOaxYWQ4tIdRZzI9em1tD0zgZKhyuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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