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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28854d492d6202de07bcbb6d8bc6ece8d6eacdaa09e99b6b0ebf09b9f3d4903e' 
  AND token = 'CsCNV74/YPd8rYbTl92R2NG2R7mAwnNVvGCv9ICc6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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