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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b1b71a03dadcb4729951f6f201fffc7e8fae702fae31a1073a665ae0ca36da' 
  AND token = 'WiR2K0sI5oCxzHONWA9ZioaBvXPhFlCEOHsOG2f5giM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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