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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb0f01cc205c678830413b063aaa8be3a459a1130b5749a80d24f8bdc6f1f83' 
  AND token = 'Na99ANKq1ap5ng/SEQtei0W7Kr8sMTf6lq00ML/7lNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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