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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe2e8216370c0fb1aee9a7f4772f62afa147df937e498bd624b39469f20e46' 
  AND token = 'j5S/cJJ8ivl2MwA6SbbLcGYwyvhAT1MP0Uavj0VrahE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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