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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a8be3b499907def48e8ebbe7d1427e9839744003966f7387899c3a2404061a' 
  AND token = 'ROgRlMic898KhE+2pUg/kvB5wwpo2ZxJOtEtEIEj/gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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