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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d1f557e617a4c2dc75614de79b9da497b76ecace2462bd6930a6b9fa9c228e' 
  AND token = 'vJVJeiDD3nzzTxeN4AXGZvQdkr3LYF6gNL7TkUb531g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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