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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac87704c46053b854529d520fc1ec73abb36b05eb56ac94a35641a90e584c38' 
  AND token = 'JjiNqYoOUjkMkif6SB8WCgdsxWB8lwvPjXaW1pxGBIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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