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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09d9fe7474bc4c21464a60210178d4097a43341ac3010ea130f75728dfde532' 
  AND token = 'wrVJ+cU1k5r2ebrR8U1+PKnU1Y7aaWQNIeyCrc6H030=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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