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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4acd7cda1b5631d599c87fc0a4190bd0879798b58edac5b752468f7906cfb7' 
  AND token = 'gvdMGnBVU9t4iILoBLu0DWWsteK1AB2t9U5ofhNovUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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