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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636c4de403fe9449ef8ba42f427c07e15966b72a336884b924f066704e4a205f' 
  AND token = 'Zsogo+HErTgyHOCEALWhaiSOSO5/X8+4Dpd2Pxord8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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