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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0383dd7c673539656226623a528187621062bcb658e10509e694e15a5538b41d' 
  AND token = '3fPj4X8Bp1hipanozYoLdaTUriltMzenL7L9rpfWrTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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