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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1e416003bfc68359ce4b7e52ec66e21d2fdfbccd219426bf96b36e5d61b1fb' 
  AND token = 'FtE6/bp+LHZCTd23GRezEV4YDJZIN9j6VBsw2WYIPUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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