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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f9c1786a4e7096b79f86bd9bb336f8901bc7809d3309c895b23d288335ab67' 
  AND token = 'CCAzxt8sxVF5Zgdo6gS8vZlSsuRxnZNy9lvUR2NsynM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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