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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9484ec248c10728f8785b2472caa4b784614de19517d6958c468bc725b7ea650' 
  AND token = 'nK4/5MPB234xlMWPYwFVAHj6AmLbOYXGw9h+cobl1So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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