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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f982c9b34726381caf8f4717abc42e888c3509afc2e688a1066f5396f7437c47' 
  AND token = 'eEY8fbgO0ziHP0rShZta38kezWDIQTSVg4AlJI8tiWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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