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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190be2aa9d7f648c4a513272a6fc3a98fdfb81ee04240e866ebf881016ba3997' 
  AND token = 'rWyvgBJUY49J9boANAzgmNh702WXfASTNr8hEwN/XHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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