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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4f38e594549814b0db765b4f5354af26956db2032b295b63aa841256f25094' 
  AND token = 'sFPxKQrCSw39VO31g9h5m+FOZUMO+sWhZ81+YArPxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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