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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3bd4dced6bd608d7ba7a156de16a047917ba40a794abae6f8919a33af52ed2' 
  AND token = 'TQVJbeZMu772mWjhMtT5XtErGrCp/Mf3DIQnlNK3MlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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