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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beab6f471ec4f0a1a5ea021a23e077ef1d643aa9049005bb832ba33abdbf080a' 
  AND token = 'QSf30hUX7mjIDlvMAfJTA5jE2zxXGmaB2Bae8dHLb04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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