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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2eabaea405e4f08cec347de3920a39d629bf6a36a7aa2b676e17c710496736' 
  AND token = 'wK97js4pYiA+CojbIT9sAIGH0GYEWqwlkpOEa4Niiwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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