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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b4f7cd6d8e7adff3d642afa19d31d45986fffae09ed4e7d33fd435ff9704c4' 
  AND token = 'eKGTj83G85gsvFypa9MUg52O+DsitXpe4fs7bNU9K2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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