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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e698c662001386ce009c813a50fd66be2d8328246bf149d808ef29549cc649' 
  AND token = 'VgyVtFeDRkZG1RCQrdZp/7V3PpvXDItGEGUPY51KVTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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