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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02420560d0693e8c42232e3be7d013c929fd4306440d10e66e3e2f6c260c733b' 
  AND token = 'IHQSjrtwNubcWObm0G+4h7YBtD8h+KIY4Tvf3+n/zec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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